OHAUS EC Series, Руководство по обслуживанию

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2-1
CHAPTER 2 DIAGNOSIS
2. DIAGNOSIS
This section contains information needed to properly evaluate the reported problem and diagnose its
cause.
2.1 SCALE SETUP AND EXAMINATION
Set up the scale according to the Instruction manual. Allow the scale to stabilize to room temperature.
Examine the scale for signs of corrosion or physical damage.
2.2 PRELIMINARY CHECKS
Power up the scale using the customer’s ac adapter. In the case where the scale will not power up,
check the ac adapter. Observe and record the error codes and software revision. Record all menu settings
as received.
2.3 TROUBLESHOOTING TABLES
Troubleshooting tables 2-1 through 2-7 identify actual types of problems that could be encountered with
the scale.
The troubleshooting tables refer to an interconnection diagram in Section 3 to assist in locating the
problem.
2-1 SCALE WILL NOT TURN ON WITH AC ADAPTER.
SYMPTOM
Scale will not turn on with AC
adapter supplied.
PROBABLE CAUSE
Adapter defective.
Membrane Switch defective.
Main PC Board is defective.
REMEDY
Refer to Section 3.1 and check the ac
adapter voltage output. If voltage is
low or nonexistent, replace the ac
adapter. If OK, proceed.
Refer to Section 3.2 and test the Mem-
brane Switch. Replace if necessary.
See Repair Procedure 4.2
If the scale fails to turn on with a new
Membrane Switch, the Main PC Board
should be tested in accordance with
section 3.4. The Main PC Board if
defective should be replaced. See Re-
pair Procedures 4.3. After repair, pro-
ceed with Performance Tests in Section
3.6.